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21-07-2017
Mathematics

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How many five digit numbers can be formed using digits 0-6 if repetitions are not allowed?

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21-07-2017

6 choices for 1st digit
5 choices for 2nd digit (since we used 1 for 1st slot already)
4 for 3rd
3 for 4th
2 for 5th

so the number of numbers is 6*5*4*3*2=720 different numbers

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